The 2023 Corvette Z06 brings impressive performance and speedy acceleration courtesy of the mid-mounted, naturally aspirated 5.5 V8 LT6 gasoline engine, but before Corvette Z06 owners can enjoy the full breadth of the LT6 rev range, the engine must first undergo a break-in period, during which the redline is lowered considerably.
The break-in period for the 5.5 V8 LT6 in the 2023 Corvette Z06 is set at 500 miles, during which the tachometer will indicate a redline of 6,600 rpm. Once the 500-mile break-in period is complete, the redline will automatically roll back to the engine’s full rev range, upping the redline mark to 8,600 rpm.
Interestingly, the break-in process for the 5.5L V8 LT6 in the 2023 Corvette Z06 is similar to that for the naturally aspirated 6.2L V8 LT2 gasoline engine cradled by the C8 Corvette Stingray. As GM Authority covered previously, the LT2 also requires a 500-mile break-in period during which the engine redline is lowered. In the case of the LT2, the redline is set at 4,500 rpm during the break-in, after which the redline is raised to 6,500 rpm. Additionally, the LT2’s maximum torque is limited during the break-in period.
As for the LT6 in the 2023 Corvette Z06, output is rated at a maximum of 670 horsepower at 8,400 rpm and 460 pound-feet of torque at 6,300 rpm. All of that muscle is routed to the rear wheels via an eight-speed dual-clutch automatic transmission.
Notably, the LT6 is a clean departure from GM’s family of Small Block V8 engines, with GM chief engineer Jordan Lee stating that the LT6 is entirely unique beyond a shared 4.4-inch bore-center spacing. With its high rev range and exotic exhaust tone, it should come as no surprise that GM benchmarked the 2023 Corvette Z06 with the naturally aspirated V8 found in the Ferrari 458. The team also added 54 easter eggs around the LT6 engine bay. Under the skin, the Corvette Z06 rides on the Y2 platform, while production takes place at the GM Bowling Green facility in Kentucky.